FreeLock is a PHP encoder that does *NOT* require any server mods. Written in PHP, using zlib (optionally) for any PHP platform. Supports IP/Host locking (to prevent redistribution) And you can easily write your own encryptor/decryptor
PPA/W is a PHP/Apache system to display your pictures in an attractive, easy-to-use manner. It was designed with digital cameras in mind, since it uses EXIF headers. Images are loaded with a perl script, and all updates are done via the web interface.